Mirror positioner for a rotating mirror camera



ENVA

MIRROR POSTIONER FOR A BOTATING MIRROR CAMERA Filed Nov. 14, 1968 showrrin FIG. 1. The image of an object that has been 3,527,110 justment in rotating the mirrors shaft. The base 8 may be positioned and securely attached by feet 12 so that RRR CAMERA surface 13 of the positioiier shaft 6 is in abutment with Beniamm T. Roggen, Embudo N. Mex gsignm. o ,me the mirrors shaft 1o. The'adjustment nut 7 is then tight United States of America as represented by the United @ned S0 hat force 1S aPPllCd hOUh the HUS bushing Siiaig mmic Energy igmmgssin and bearing assembly 17, 16, 15, 14 and surface 18 be- Fiied Nov. 14, 1968,er.No.775,742 comes pressed against shaft 13. Movement of tangent f* w 1 ine iCi. Fien 25/12 a ar1n 1 1 causes rotation of the shaft i3 which is transmitted 11.5. 1,1. lah-89.15 2 Ciaiins to Shaf 13.

Pressure is applied at surface 18 by means of a thrust bearinf7 16. Shaft 6 is free to rotate Whil h f Tl L VS o l g c. et e orce ap- BSRACT 0F 'Lm E?! CLJURE. plied by tightening nut 7 is transmitted through thrust A device for positioning the mirror of a rotating mirbushing 17, thrust bearing 16, ball bearing 15, and bearror camera so that the mirror will accurately fold the ing retainer 14 to shaft 13. primary optical axis of the camera so as to be coincident 15 Other means of securing shaft 6 to shaft 13 could be with the optical axis of the focusing microscope. A shaft utilized. For example, mating grooves on the two shafts in the device is placed in engagement with the rotating could be engaged to provide simultaneous rotation of the mirrors shaft and held in engagement by a multiple lead shafts. actuating nut. Movement of a tangent arm that extends FIG. 3 is an end view of the device showing the spring from the shaft in the device causes rotation of both shafts. loaded plunger 19 and "tangent screw 118 in position to Fine adjustment is accomplished by a tangent screw and provide ne adjustment in the rotation of the shafts. Tanspring loaded plunger operating in opposition thereto, gent screw 1i? is located normal to the tangent arm 11 said tangent screw and plunger located normal to the tanand held in place by support 9. Spring loaded plunger 19 .5,6m arm is located normal to tangent arm 11 directly opposite n wm- 25 from the tangent screw 1.-Adjustment of the tangent screw 1t) moves the tangent arm 11 and the force of the spring in piunger 19 maintains the tangent arm in position with the tangent screw 10.

FIG. 4 shows the details of plunger 19. It consists of a plunger housing 29, a spring 21 and plunger 22.

The application of a device incorporating applicants MIRROR PGSTIONER FR A RGTATENG The invention described. herein was made in the course of, or under, a contract with the U.S. Atomic Energy Commission.

This invention relates to a device that enables precise o alignment of the mirror of a rotating mirror camera.

Rotating mirror cameras require a high degree of precision in the alignment procedures. A need exists for a simple and inexpensive device that may be made a part of the rotating mirror drive that provides for both coarse 5 and fine adjustment in locating the rotating mirror in a given angular position. Applicants invention satisfies these requirements with a minimum of structure and therefore is easy to build, operate, and maintain. a lfnifrabutment Wlth the Shaft (13) 0f the In a rotating mirror smear camera the object of inan adjustneut nut (7) 'wound said Shaft (6 d tei-est is focused on the slit plane of the camera by means t bi d b an roof an objective lens. The image of the slit is focused .by a a tmme 1g i331 35e (3), b1 i a transfer lens system on the film plane. The rotating a 111515 fusstmefl (CUUsfaS/ H `Y (17, i5, 5 and mirror interposed between the 'transfer lens system and zo Si Slrlfond yseocogdlolrtlisogeg; Ionfo th? mm planefolds that portion of 'the Camera' Opm 45 is rotatabl mounted to sfid haft (15) and abuts axis. As the mirror rotates, the image of the slit traverses d L '57 h h l v the film plane providing a time-space record of the event .Sal pdu( )(Sguc :tuatte ofmln fof Sald (7) focused on the slit at the slit plane. When the camera is m Sai ase 1 W^ IL OVC Sm CS 2 mfO I'ICUOUSI being accurately focused, theoptical axis of the camera tenfbmem (15% s111f0f Shaluhd h n must be made coincident with the optical axis of the a zingen arg? vl) Y mount@ t0 Sal S M (6) focusing microscope, said microscope being focused at (ltlnetrlvg;SSTH, t u o* It th l the film emulsion plane. This alignment is easily accomtldcnal axis of mid rrla) ambttigo Oeneolil plislicd by the applicants device and not disclosed by of Said arm (M mid Screw bing mtambely moutprior art. A FTQ. l is a diagram showing the alignment of a iotat- 5 lllgploilpsg iig ing mirror camera.

FIG. 2 is a sectional side view of applicants device on gottlllnrag msfigtrolrggffte (lfe) aesrn line with the rotating mirror shaft.

FIG 3 is an end View of applicant,S devishafts (6 and 1.a) are in frictional engagement.

c W O the S Isn loaded hmger 2. rotating mirror alignment device as in claim 1 61613515118 (l Sectional Vle f p l g p including a spring-loaded plunger (.19) mounted in said support (9) substantially normal to the longitudinal axis Alignment of the lens system miiioi and film strip is of Said arm (11) and abutting the Opposite side of Said arm (11), the spring force of said plunger (19) maintaining the tangent aim (11) in abutting contact with said tangent screw (11)).

obvious to those skilled in the art.

What I claim is:

1. A device for rotatably aligning the mirror of a rotating mirror camera comprising:

a base (8) for mounting said device,

focused at the slit plane 23 is reected olf of mirror 2 and refocused at the film plane 3 by transfer lens means 65 1a. In order to insure focusing, a microscope d is placedon the far side of lm strip 3 and viewed by eye. The mirror shaft (the axis of the mirror shaft is shown coming out of FIG. l through point 5) must be rotated to provide alignment and a problem has existed in provid- 2,338,271 ing fine adjustment in such rotation.

FIG. 2 shows applicants device which provides ne ad- References Cited UNITED STATES PATENTS 1/1944 Ulanet 74-89.15

WESLEY S. RATLFF, J'R., Primary Examiner invention to a rotating mirror fast-framing camera will bey 

